Electrical heater.



I F.KUHN.

ELECTRICAL HEATER.

APPLICATION FILED JAN.5,1914.

Patented Mar. 9, 1915.

2 SHEETSSHEET 1.

Motive/ended F. KUHN.

ELECTRICAL HEATER.

APPLICATION FILED JAN. 5, 1914.

2 SHEETS-SHEET 2.

l a J 75 wwwadau fnwm 5% I fl.

FRANK-KUHIL 015 DETROIT, MICHIGAN.

ELECTRICAL HEATER.

Specification of Letters Patent.

Patented Mar, 9, 1915.

Application filed January 5, 1914. I Serial No. 810,469.

To all whom it may concern Be it known that I, FRANK KUHN, a citizen of the United States of America, residing at Detroit, in the county of \Vayne and State of Michigan, have invented certain new and useful Improvements in Electrical Heaters, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention relates to electrical heaters of that type employed as toasters and for similar devices in which the heat is transmitted from the unit by radiation.

It is usual to provide a protecting casing for the heat radiating unit, and where the heater is used as a toaster it is also usual to provide hinged supports for holding the bread or other material in position for toastmg.

The present invention has particular reference to the construction of this protecting frame, and it is an object to form said frame from sheet metal stampings.

In the drawings: Figure 1 is a perspective view of the heater as designed for a toaster;

Fig. 2 is a cross section; Fig. 3 is a longi tudinal section through a portion of the instrument; andFig. 4 is a horizontal section. V

The heating unit A is preferably in the form of a flat armored resistor, having tcrminal contacts B projecting laterally. from the lower portion thereof.

C is the frame which is formed from sheet metal stampings and is of the following detailed construction: D is a base member struck up from sheet metal to form depending edge flanges D and having a central longitudinally-extending slot E for'the passage of the heating element, this being provided with the laterally-extending slots E for the passage of the terminals B. F and F are vertical frames, which are struck out from sheet metal and are provided with inwardly-extending marginal flanges G at the top and the sidesthereof.- These members F and F are cut away opposite the resistor toavoid obstructing the radiation, but crossing this cut-away area are bars H, which are twisted so as to expose only the edges there of to the radiating surface of the unit. At

' g the opposite edges of the frame the flanges G are provided with inward extensions I, which are bent to form groovedguides for engagement with the edges of the'heating latter extend inward to underlap a portion of the top flanges G of the members F and F, to which they are secured, preferably by spot-welding, as indicated at M. The lower portions of the frames F and F are preferably slightly flared or spread outward and are secured to the base D by tongues N passing through slots in said base and bent under the same. The hinged frames, or toast supports 0 are also preferably formed from sheet metal and are cut away to form an open grating. The lower ends of these members engage a rod P which forms the hinge connection with the body of the frame, engaging outwardly-projecting lugs Q there-' on, while a spring R upon the rod causes a resilient clamping connection. The upper edge of the member 0 is turned over a wire S which forms a beaded edge,'while pro-f jecting portions S of the wire form handles for turning down the frames.

The construction as described is one that is inexpensive to manufacture, being formed almost entirelyof sheet metal stampings, which are easily assembled without the use of bolts other than thosewhich support the heating element. The construction also hasa pleasing appearance, as the. fiat faces of the sheet metal which are exposed to view give the effect of a solid and substantial construction. On the other hand, by the use of sheet metal in place of castings, the weight is greatly reduced, while the strength is even greater. If desired, the base D may be supported {upon non-metallic footpieces T arranged at the'corners as shown.

What I claim as my invention is 1. A frame for electric heater, comprising a pair of complementary sheet metal stampareas crossed by traiisversely-extending integral bars, said bars being twisted to expose the edges only in the open areas.

2. A frame for electric heater, comprising a pair of sheet metal stampings having transversely-extending marginal flanges abutting against each other, the opposite edges being provided with inturned flanges, forming a guide and support for the heater element, and the portion intermediate the edges being cut away to form open areas crossed by integral bars.

3. A frame for electric heater, comprising a pair of sheet metal stampings having edge flanges bent transversely and abutting against each other to space the parallel portions of said stampings, said parallel portions being cut away to form open areas crossed by integral bars which are twisted to expose the edges only in said open areas, a base upon which said stampings are mounted secured to. the lower ends thereof,

and a top secured to stampings.

. 4. A frame for electric heater, comprising a pair of sheet metal stampings. cut away to form open grids, the edges of said stampings being turned in to abut against each other, a top formed of a sheet metal stamping having downturned ends secured to the top flanges of said pair of stampings, and a sheet metal base to which the lower ends of said pairs of stampings are secured, said base being slotted for the insertion of the heating element therethrough and in between said pair of stampings.

5. A frame for electric heater, comprising a sheet metal base having downturned marginal flanges, a sheet metal top having edge flanges and downturned ends, and. a pair of sheet metal stampings extending vertically intermediate the base and the top,

having side and top flanges bent inward and the upper ends of saidv 7. A frame for electric heater, comprising a sheet metal base, a sheet metal top,

complementary sheet metal stampings extending vertically between said base and top, and each formed with open areas with transversely-extending integral bars and flanged edges abuttingagainst each other, the side edges having inward extensions forming grooved guides for engaging the heating unit, and hinged supports secured.

to said complementary stampings, being also formed of sheet metal stampings. I 8. A frame for electric heating unit,

comprising a pair of complementary sheet metal stampings having flanged edges abutting, with inward extensions at the opposite sides forming grooved guides for receiv ing the heating unit, a slotted base secured to said complementary stampings and through which the heating unit is-inserted into engagement with said grooved guides, and detachable transversely-extending pins for supporting said unit when engaged with said guides. 9. A frame for electric toaster, comprising a pair, of'complementary' sheetmetal grid stampings, having marginal abutting flanges for spacing the grids, the cross bars.

of said grids being twisted to present the edge only in the open area, and ahinged support formed of a sheet metal stamping having untwi'sted bars opposite the twisted bars of said grids.

10. A frame for electric toasters, comprising a sheet metal grid stamping having twisted cross bars exposing the edges only in the open area, a hinged frame formed of sheet metal having untwisted bars opposite said twisted bars, a rod connecting the ends of said bars and forming a hinge, and a rod forming abeaded edge for the upper end of said hinged frame and extending outward to form an operating handle.

11. Aframe for an electric heater, comprising a pair of complementary sheet metal members having'flanged edges, a portion of said members being cut away to form open spaces with intermediate transversely-em tending bars, said bars being twisted to expose the edges only in the open area. In testimony whereof I afiixmy signature in presence of two witnesses.-

. FRANK KUHN.

Witnesses:

WM. J. BELKNAP, JAMES P. BARRY. 

